Telephone line polarity tester



FIG. 1 is a left and top-front perspective view of a telephone line polarity tester showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a telephone line polarity tester, as shown and described. 